Support bulk read on Dediprog SF100.

Should result in native speed for plain read and erase.
Should result in a measurable speedup for writes due to a fast verify.
Packet size is 512 bytes. Depending on your USB hardware and the
Dediprog firmware version, this may not work at all. That said, it
worked on the hardware we tested.

Add lots of error checking where it was missing before.

Thanks to Richard A. Smith, Mathias Krause and David Hendricks for
testing multiple iterations of this patch.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-By: Richard A. Smith <richard@laptop.org>
Acked-By: Mathias Krause <mathias.krause@secunet.com>


git-svn-id: https://code.coreboot.org/svn/flashrom/trunk@1234 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

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